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DO NOT USE CAST IRON <br />COVERS IN ABOVE GRADE OR <br />INDOOR INSTALLATIONS <br />Use composite cover C241-12 for <br />above grade installations <br />Secure Cover Adapters <br />Cover adap-ers must be secured <br />to base units in above grade <br />installations with increased head <br />pressure conditions. Use cover <br />adapter tie -down kit model ATDI. <br />Suspended Installations <br />Design trapeze to support the wet <br />weight of the unit. Do not partially <br />support unit or suspend unit using <br />metal U -channel to create a trapeze. <br />High Water Table <br />Installations <br />Interceptors and risers are not <br />designed to withstand water table <br />height in excess of the top of the <br />unit when buried (see figure). If it is <br />possible for this to occur, install the <br />interceptor and risers in a <br />water -tight concrete vault or <br />backfill with concrete or flowable <br />fill (wet concrete and flowable <br />backfill should be poured in stages <br />concrete floor <br />to avoid crushing the Interceptor). <br />At risk areas include but are not limited to tidal surge areas, floodplains <br />and areas that receive storm water. Great Basin'" models that are direct <br />buried in high water table scenarios must be installed with an anchor kit. <br />Model GB -50 uses model AKl anchor kit. <br />Hydrostatic/ <br />Pressure Slabs <br />When installed under a <br />hydrostatic slab (slab <br />designed to withstand <br />upward lift, usually caused <br />by hydrostatic pressure) <br />interceptor must be <br />enclosed in a watertight <br />concrete vault, <br />concrete slab subject to hydrostatic pressure <br />watertight <br />concrete <br />vault — <br />DO NOT <br />COMPACT BACKFILL <br />MECHANICALLY <br />Compact by <br />hand only <br />Below Grade Installation Slab Requirements <br />A concrete slab to finished grade with rebar is required when installing <br />interceptor below grade. <br />Rebar 4" min. <br />slab <br />Pedestrian Traffic or <br />Greenspace Areas <br />Installations with Risers <br />3 FCR2 Risers Max <br />94 \\ <br />It/i AAS �i�r <br />1 , <br />\ <br />Corrugated Riser Pipe <br />Requirements <br />Riser adapter model CA2 must be <br />used when installing interceptors <br />using 24" diameter corrugated <br />pipe as a riser. This will adequately <br />embed the cover adapter in the <br />concrete slab, preventing <br />cover/cover adapture failure <br />under traffic rated loads. <br />Rebar 8" min. <br />slab <br />I <br />Vehicular Traffic Areas <br />Max Water Level <br />Risers are not designed <br />to retain water <br />{I <br />Schier I GB -50 Installation Guide page 3 of 10 <br />